In this troubleshooting situation, a restaurant manager is calling for service on a reach-in freezer, and the complaint is that the unit “isn’t freezing things hard.”

When you arrive, you confirm that the equipment, which is designed to have a box temperature of 0 to 5° F, is maintaining a temperature near 35°F. You also note that the compressor, condenser fan motor, and evaporator fan motor are all operating. Clothes Dryer Heating Element

As your first step in evaluating this situation, you check the condenser coil and find it to be clean. When you check the condition of the indoor coil, you find that it is clogged with frost. When you check the wiring diagram (see Figure One - top), you note that this equipment is designed to defrost on a time schedule, and when the timer advances to the defrost mode, a normally closed switch wired in series with the compressor opens, and a normally open switch wired in series with the defrost heater closes.

Following the manufacturer’s recommended procedure, you manually initiate a defrost mode and find that:

Your troubleshooting question: What is the next step you need to take in servicing this equipment?

Compare your answer with ours here.

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